If you are interested in validation, check out our validation guide on using OSMCha. From the past one month, we have been observing a lot of Pokemon Go mappers adding footways, cycleways, pedestrians, parks etc. Some of them are adding valuable data and while some are doing fantasy mapping. Do keep an eye on the edits happening in your neighborhood and comment on changesets which seem inconsistent to let the user know which will help them become better mappers and also lets us maintain the data quality on OpenStreetMap

Reverting/deleting an newly added water pond which is clearly existing on the imagery (when your comment above and in the reverting changeset) says the opposite, is not the correct way to do.

I don't know how you can check that remotely or which kind of imagery you used to revert these additions: the added ponds are present in SEVERAL imagery sources and they also match with terrain elevation data and surrounding water drains.